Usage of solar-spouted bed drier in the drying of parboiled wheat, corn and pea

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2010

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Tunaboyu, Ferihan

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The main objective of this study was the application of solar energy for drying of parboiled wheat, corn and pea. Drying experiments were performed under open sun and also in the solar-spouted bed drier in which air heated by solar energy was used. The effects of these drying methods on drying rate and quality parameters were investigated for drying of parboiled wheat, corn and pea. The quality parameters evaluated were color, shrinkage, bulk density, apparent density, bulk and internal porosity, microstructure, pore size distribution, sphericity and rehydration ratio. For peas, ascorbic acid content was also measured. In solar-spouted bed drying, drying rates and effective diffusivity values for all samples were determined to be higher and therefore drying time was significantly lower as compared to open sun drying. Effective diffusivities were in the range of 0.30x10-10 m2/s - 0.65x10-10 m2/s for open sun and 1.35x10-10 m2/s - 3.65x10-10 m2/s for solar-spouted bed drying of different samples. In general, better quality parameters for solar-spouted bed dried samples were observed such as less shrinkage, higher rehydration capacities, more homogenous pore size distribution and higher ascorbic acid retention.

Subject Keywords

Solar energy

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http://etd.lib.metu.edu.tr/upload/12612927/index.pdf
https://hdl.handle.net/11511/20336

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

F. Tunaboyu, “Usage of solar-spouted bed drier in the drying of parboiled wheat, corn and pea,” M.S. - Master of Science, Middle East Technical University, 2010.